⚡️(app-desk) remove firefox from e2e tests

- Remove Firefox testing, Firefox browser seems unstable with
Playwright, most of the time the failing tests are the one
with Firefox, Firefox is only 3% of the browser.
- Improve some naming in the test creation to avoid
conflit name.

src/frontend/apps/e2e/playwright.config.ts

@@ -46,12 +46,6 @@ export default defineConfig({
       name: 'chromium',
       use: { ...devices['Desktop Chrome'], locale: 'en-US' },
     },
-
-    {
-      name: 'firefox',
-      use: { ...devices['Desktop Firefox'], locale: 'en-US' },
-    },
-
     {
       name: 'webkit',
       use: { ...devices['Desktop Safari'], locale: 'en-US' },